<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        *{
            padding: 0px;
            margin: 0px;
            background: chartreuse;
        }
        #a{
            color: skyblue;
        }
        .demo{
            color: red;
        }

    </style>
</head>
<body>
<a style="" id="a" href="">真不错</a> <br/>
<a class="demo" href="">真不错哦</a> <br/>
<a class="demo" href="">真不错哦</a> <br/>
<a class="demo" href="">真不错哦</a> <br/>
<a href=""></a>
</body>
</html>